IS1161:1998 STEEL TUBES FOR STRUCTURAL PURPOSES SPECIFICATION ( Fourth Revision ) First Reprint NOVEMBER 1998 ICS 77.140.75 ; 91.220 Q BIS 1998 BUREAU OF INDIAN STANDARDS MANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG NEW Junuary 1998 DELHI 110002 Price Group 3 Steel Tubes, Pipes and Fittings Sectional Committee, MTD 19 FOREWORD This Indian Standard ( Fourth Revision ) was adopted by the Bureau of Indian Standards, after the draft finalized by the Steel Tubes, Pipes and Fittings Sectional Committee had been approved by the Metallurgical Engineering Division Council This standard was first published in 1958 and its first, second and third revisions were issued in 1963. 1968 and 1979 respectively. While reviewing the standard, the Committee has felt it necessary to revise this Indian Standard with the following modifications: a) Thickness andmass is aligned with IS 1239 (Part 1) : 1990. b) All amendments have been incorporated. In the formulation of this standard, due consideration has been given to the trade practices followed in the country in this field. Due consideration has also been given to international co-ordination among the standards prevailing in different countries. Assistance has been derived from the following publications: ISO/R 336 : 1976 Plain end steel tubes, welded or seamless; general table of dimensions and masses per unit length. International Organization for Standardization. BS 6323 : 1982 Steel tubes for-mechanical and general engineering purposes. British Standards Institution. This standard contains clauses 8.1 and X2.1 which call for agreement between the purchaser and the manufacturer. For the purpose of deciding whether a particular requirement of this standard is complied with, the final value, observed or calculated, expressing the result of a test or analysis, shall be rounded off in accordance with IS 2 : 1960 `Rules for rounding off numerical values (revised)`. The number of significant places retained in the rounded off value should be the same as that of the specified value in this standard. IS 1161 : 1998 Indian Standard STEEL TUBES FOR STRUCTURAL PURPOSES SPECIFICATION -(-Fourth Revision ) 1 SCOPE This standard covers the requirements for hot finished welded (HFW), hot finished seamless @IFS), and electric resistance welded (ERW) or high frequency induction welded (HRIW) plain carbon steel tubes for structural purposes. 2 REPERENCES The Indian-Standards listed below are the necessary adjuncts to this standard: IS No. 228 : 1983 1239 (Part 1) : 1990 1387: 1993 as `Light', `Medium' and `Heavy' depending on the wall thickness (see Table 1). They shall be further graded as Y St 2 10, Y St 240 and Y St 3 10 depending on the yield stress of the material (see Table 2). The designation of the steel tubes shall, therefore, include the nominal bore ofthe tube, classification on wall thickness and grade of the material. 4 SUPPLY OF MATERIAL 4.1 General requirements relating to the supply of the steel tubes for structural purposes shall conform to IS 1387. 5 MATERIAL 5.1 The tubes shall be manufactured from steel as given in Table 3 and shall be supplied in the conditions as shown therein. 6 DIMENSIONS AND WEIGHTS 6.1 The standard sizes and weights of tubes for structural purposes shall be as given in Table 1. 6.1.1 Some geometrical properties of the steel tubes Title Method of chemical analysis of steel (in various parts) Mild steel tubes, tubulars and other wrought steel fittings: Part 1 Mild steel tubes (#ifth revision) General requirements for the supply of metallurgical material (second revision) Mechanical testing of metals Tensile testing Method for flattening test on metallic tubes #rst revision) Method for bend test on metallic tubes (in full section) (fwst revision) Methods for sampling of steel pipes, tubes and fittings (first revision) Hot-dip zinc coatings on mild steel tubes (jkst revision) Code of practice for packaging of steel tubes @rst revision) Hot-rolled steel strip for welded tubes and pipes yirst revision) 1608: 1995 2328: 1983 2329: 1985 are also given in Table 1 for information. 6.1.2 Tubes of thickness lower than light tubes, specified in Table 1 shall not be permissible. 6.2 Tolerances The following tolerances shall apply: 4711: 1974 a) Outside Diameter: 1) Up to and including 48.3 mm +0.4mm _ o, 8 _ f 1.Opercent 4736: 1986 4740 : 1979 10748 : 1995 3 DESIGNATION 2)Gver48.3mm b) Thickness flor all sizes): 1) Welded tubes 2) Seamless tubes + Not limited - 10 percent + Not limited - 12.5 percent + 10 percent - ~8 percent cl Weight: 1) Single tube light 3.1 Steel tubes covered by this standard shall be designated by their nominal bore and shall be calssified 1 Table 1 Sizes and Properties of Steel `hbes for Structural Purposes (Clauses3.1,6.1,6.1.1and6.1.2) Nominal Bore mm (1) 15 Outside Diameter Thickness Weight Area of Cross Section cm' (6) 1.21 1.53 1.82 1.78 1.98 2.38 2.54 3.06 3.73 Internal Volume Surface External cm3/m (7) 235 203 174 390 370 330 638 585 518 B Y .. 5 Internal cm3/m (9) 543 506 468 700 681 644 895 857 807 Moment of Inertia 4 Modulus of Section 3 ("II, Radius of Gyration Square of Radius of Gyration 2 ("1") g mm (2) 21.3 (3) Light Medium Heavy Light Medium Heavy Light Medium Heavy mm (4) 2.0 2.6 3.2 2.3 2.6 3.2 2.6 3.2 4.0 kg/m (5) 0.947 1.21 1.44 1.38 1.56 1.87 1.98 2.41 2.93 cm3/m (8) 669 (";"o, 0.57 0.69 0.75 1.36 1.48 1.70 3.09 3.61 4.19 0.54 0.64 0.70 1 .Ol 1.10 1.26 1.83 2.14 2.48 0.69 0.66 0.55 0.87 0.86 0.84 1.10 1.08 1.05 0.47 0.44 0.42 0.76 0.74 0.71 1.21 1.17 1.11 20 26.9 845 25 33.7 1 059 N 32 42.4 Light Medium Heavy Light Medium Heavy Light Medium Heavy Light Medium Heavy Light Medium Heavy Light Medium Heavy 2.6 3.2 4.0 2.9 3.2 4.b 2.9 3.6 4.5 3.2 3.6 4.5 3.2 4.0 4.8 3.6 4.0 4.8 2.54 3.10 3.79 3.23 3.56 4.37 4.08 5.03 6.19 5.71 6.42 7.9j 6.72 8.36 9.90 8.70 9.63 11.5 3.25 3.94 4.82 4.13 4.53 5.56 5.23 6.41 7.88 7.32 8.20 10.1 8.61 10.7 12.7 11.1 12.3 14.6 1 086 1 017 929 1 418 1 378 1 275 2 332 2 213 2 066 3 814 3 727 3 534 5 343 5 138 4 936 6 995 6 877 6 644 1 332 1 168 1 130 1 080 1 335 1 316 1 265 1 711 1 667 1 611 2 189 2 163 2 107 2 591 6.47 7.62 8.99 10.70 11.59 13.77 21.59 25.88 30.90 48.79 54.02 65.12 751.23 96.36 112.52 133.27 146.32 171.44 3.05 3.59 4.24 4.43 4.80 5.70 7.16 8.58 10.2 12.82 14.20 17.1 17.82 21.68 25.31 26.23 28.80 33.75 1.41 1.39 1.36 1.61 1.59 1.57 2.03 2.00 1.98 2.58 2.57 2.54 3.03 3.00 2.98 3.41 3.45 3.43 1.98 1.93 1.86 2.59 2.54 2.41 4.13 4.02 3.92 6.66 6.60 6.43 9.19 9.00 8.88 12.03 11.91 11.76 40 48.3 1 517 50 60.3 65 76.1 2 391 80 88.9 2 793 2 540 2 490 2 964 2 939 2 889 90 101.6 3 192 100 114.3 Light Medium Heavy Light Medium Heavy Light Medium Heavy Light Medium Heavy Light Medium HeaY Light Medium Heavy 1 Heavy 2 Light Medium H=T Light Medium Heavy Heavy Heavy Heavy Heavy 3.6 4.5 5.4 4.5 4.8 5.4 4.5 4.8 5.4 4.5 4.8 5.4 4.5 4.8 5.4 4.5 4.8 5.4 6.3 4.8 5.4 5.9 4.8 5.6 5.9 5.9 5.9 6.3 8.0 9.75 12.2 14.5 13.6 14.5 16.2 15.0 15.9 17.9 16.4 17.5 19.6 17.8 18.9 21.3 18.2 19.4 21.7 25.2 22.4 25.1 27.3 25.4 29.5 31 .o 34.7 38.9 49.3 68.6 12.5 15.5 18.5 17.3 18.4 20.6 19.1 20.3 22.8 20.9 22.2 25.0 22.7 24.2 27.1 23.1 24.7 27.6 32.0 28.5 32.0 34.8 32.3 37.5 39.5 44.2 49.5 62.8 87.3 9 004 8 704 8 409 10 930 10 819 10 599 13 410 13 287 13 043 16 142 16 008 15 740 19 128 18 981 18690 19 921 19 771 19 473 19 030 26 606 26 260 25 974 34 454 33 930 33 734 42 507 53 557 76 073 90 533 3 591 3 363 3 306 3 250 3 705 3 686 3 649 4 104 4 085 4 047 4 503 4 484 4446 4 902 4 883 4 845 5 4 4 4 002 983 946 889 192.03 234.3 274.5 325.3 344.58 382.0 437.2 463.44 514.5 572.2 606.92 674.5 732.6 777.32 864.7 777.2 824.78 917.7 1 053 1271.71 1 417 1 535.2 1 856.51 2 141 2 247 3 149 4 412 7 992 13 111 33.60 41.0 48.0 51.2 54.27 60.2 62.6 66.35 73.7 75.1 79.65 88.5 88.7 94.16 105.0 92.4 98.01 109.0 125.0 131.31 146 158.65 169.47 195 205 258 323 493 737 3.92 3.89 3.85 4.33 4.32 4.30 4.78 4.77 4.75 5.23 5.22 5.20 5.68 5.67 5.65 5.79 5.78 5.76 5.73 6.68 6.66 6.64 7.58 7.55 7.54 8.44 9.45 11.2 12.3 15.36 15.10 14.86 18.78 18.69 18.52 22.89 22.76 22.58 27.37 27.25 27.05 32.27 32.14 31.92 33.56 33.42 33.21 32.85 44.63 44.36 41.11 57.45 57.02 56.86 71.21 89.30 125.44 151.29 t: 110 127.0 3 990 125 139.7 4 389 135 152.4 4 788 150 165.1 5 187 150 168.3 5 287 w 175 193.7 6 085 5 781 5 743 5 712 6 578 6 528 6 509 7 307 8 202 9 775 10 663 200 219.1 6 883 7 681 8 578 10 177 11 173 225 250 300 350 244.5 273.0 323.9 355.6 IS 1161 : 1998 Medium f 10 percent Heavy 2) 10 tonne lots light Medium f 7.5 percent Heavy j NOTE - For 10 tonne lots, the weighment may-be done in convenient smaller lots and added up at the option of the manufacturer. l the values specified for the relevant grades of tubes given in Table 2. 11.2.1 The tensile test shall be made on: 5 percent a) a length cut from the end of the selected tube (the ends of the length being plugged for grips, where necessary); or b) a longitudinal strip cut from the tube, not including the weld, ifany, and tested in the curved condition, the choice resting with the manufacturer. Table 2 Tensile Properties of Steel `lhbes for Structural Purposes ( Clauses 3.1 and 11.2 ) Grade Tensile Strength (Min) Yield Stress (Min) Elongation on Gxuge Length 5.65 \iS, Min 7 woRKMANsHIP 7-l The tubes shall be cleanly finished and reasonably free from scale. They shall be free from cracks, surface flaws, laminations and other defects. The ends shall be cut cleanly and square with the axis of tube, unless otherwise specified. Surface imperfections such as handling marks, light die or ~011 marks, or shallow pits shall not be considered as defects provided the imperfections are removable within minimum wall thickness permitted. Removal of such surface imperfections is not required. Welded tubing shall be free of protruding metal on the outside surface of the weld seam. 8 GAW.ANIZING MPa Yst 2~10 YSt 240 Yst 310 330 410 450 MPa 210 240 310 Percent 20 17 14 NOTES 1 1 MPa = lN/mml= 0.102 kgflmm' 2 Elongation percent for tubes up to and including 25 mm nominal bore for all grades shall be 12 mmimum. 8.1 If the tubes are required in galvanized condition the zinc coating on the tubes shall be conforming to the requirements and tested as per methods, specified in IS 4736. Sl Table 3 Steel and Supply Conditions ( Clause 5.1) No. Manufacturing Process Steel SUPPlY Conditions 9 STRAIGHTNESS 9.1 Unless otherwise agreed to between the purchaser and the manufacturer, tubes shall not deviate from straightness by more than 1 mm in any 600 mm length. 10 LENGTHS 10.1 The tubes shall normally be supplied in random lengths at 4 to 7 m. If ordered in exact lengths, the tolerances shall be subject to prior agreement between the manufacturer and the purchaser. i) HPW IS 10748 with Bars/ingots chemical suitable composition as per IS 10748 to achieve mechanical proper ties .for respective grades IS 10748 Only YSt 210 or YSt 240 YSt 210, YSt 240 or YSt 310 ii) HFS iii) ERW/HRIW 11 MECHANICALTESTS 11.1 The following tests shall be carried out on the selected tube, strip or plate. For mechanical tests, tubes shall be sampled in accordance with IS 47 11. 11.2 Tensile Test The tensile strength, the yield stress and the percentage elongation shall be determined in accordance with the methods specifiedin IS 1608 and shall be not less than YSt 210, YSt 240 or YSt 310 as heat welded, treated or cold and drawn normalized NOTE - If required the copper bearing steel may be used to impart weather resistant properties in the steel. Copper content shall be between 0.20 to 0.35 percent subject to mutual agreement between the supplier and the purchaser. 4 IS 1161 : 1998 11.3 Ductility Test 11.3.1 Cold Bend Test ( Up to and Including 50 mm NB) When tested in accordance with IS 2329 an unfilled length of tube shall be capable of being bent cold by tube bending machine around a grooved former (with radius at bottom of the groove equal to 6 x 0. D. of the tube) through 180" (with weld at 90" to the plane of bending) without showing any crack at the weld or themetal. 11.3.2 Flattening Test ( TubesAbove 5Omm NB ) Rings, not less than 40 mm in length cut from the ends of selected tubes with edges rounded shall be flattened between parallel plates with the weld, if any, at 90" (point of maximum bending) in accordance with IS 2328. No opening shall occur by fracture in the weld until the distance between the plates is less than the value specified for each grade in co1 4 of Table 4 and no cracks or breaks in the metal elsewhere than in the weld shall occur until the distance between the plates is iess than the value specified for each grade incol5 ofTable4. 11.4 Retest Should any one of the test pieces first selected fail to pass any of the tests specified, two further samples shall be selected for testing in respect of each failure from the same lot. Should the test pieces from both these additional samples pass, the material represented by the test samples shall be deemed to comply with the requirement of that particular test. Should the test pieces from either of these additional samples fail, the material represented by the test samples shall be deemed as not complying with the standard or the manufacturer may select to test individually the remaining lengths in the lot for the test failed to comply in the preceding tests. 11.5 Sampling 11.5.1 Sampling ofTubes For the purpose of drawing samples all mild steel tubes bearing same designation and manufactured under a single process shall be grouped together to constitute a lot. Each lot shall be sampled separately and assessed for conformity to this specification. 11.5.2 Sampling and Criterion for Conformity Unless otherwise agreed to between the manufacturer and the purchaser the procedure for sampling of tubes for various tests and criteria for conformity shall be asgiven in IS 47 11. 12 MARKING 12.1 Each tube shall be suitably marked with the manufacturer's name or trade-mark, and class of the tube. 12.1.1 The tubes may also be marked with the Standard Mark. 12.1.2 The use of the Standard Mark is governed by the provisions of the Bureau of Indian Standards Act, 1986 and the Rules and Regulations made thereunder. The details of conditions under which~the licence for the use of Standard Mark may be granted to manufacturers or producers may be obtained from the Bureau of Indian Standards. 13 OILINGANDPAINTING 13.1 All tubes shall, unless otherwise specified, bc varnished, painted or oiled externally. 14 BUNDLING AND PACKING 14.1 Where tubes are to be bundled for transport, they shall unless otherwise specified, be packed in accordance with IS 4740. Table 4 Flattening Requirement in Metal (Clause 11.3.2) Sl NO. Manufacturing Process Metal Steel Grade Weld (Distance Between the Plates) Parent (Distance between the Plates) i) HFWIHFSIERWIHFIW HFWIHFSIERWIHFIW ~FHS/ERW/HFIW I) O.D. = Outside diameter. Yst 210 YSt 240 Yst 310 75 percent of 0.D." 85 percent of O.D. 85 percent of O.D. 60 percent of 0.1). 75 percent of 0.11. 75 percent of O.D. ii) iii) 5 Bureau of Indian Standards BIS is a statutory institution established under the Bureau oflndian Standards Act, 1986 to promote harmonious development of the activities of standardization, marking and quality certification of goods and attending to connected matters in the country. Copyright BIS has the copyright of all its publications. No part of these publications may be reproduced in any form without the prior permission in writing of BIS. This does not preclude the free use, in the course of implementing the standard, of necessary details, such as symbols and sizes, type or grade designations. Enquiries relating to copyright be addressed to the Director (Publications), BIS. Review of Indian Standards Amendments are issued to standards as the need arises on the basis of comments. Standards are also reviewed periodically; a standard along with amendments is reaffirmed when such review indicates that no changes are needed; if the review indicates that changes are needed, it is taken up for revision. Users of Indian Standards should ascertain that they-are in possession of the latest amendments or edition by referring to the latest issue of `BlS Handbook' and `Standards : Monthly Additions'. This Indian Standard has been developed from Dot : No. MTD 19 ( 4099 ). Amendments Issued Since Publication Amend No. Date of Issue Text Affected BUREAU -Headquarters: OF INDIAN STANDARDS Telegrams: Manaksanstha ( Common to all offices ) Telephone 323 76 17 323384: 337 84 99,331 I 337 86 26, 337 60 60 I 235 02 16,235 235 15 19,235 85 61 86 62 38 43 20 25 04 42 23 15 Manak-Bhavan, 9 Bahadur Shah Zafar Marg, New Delhi 110002 Telephones : 323 01 31, 323 94 02, 323 33 75 Regional Offices: Central : Manak Bhavan, 9 Bahadur Shah Zafar Marg NEW DELHI 110002 Eastern : l/14 C. I. T. Scheme VII M, V. I. P. Road, Maniktola CALCUTTA 700054 Northern : SC0 335-336, Sector 34-A, CHANDIGARH 160022 Southern : C. I. T. Campus, IVCross Road, CHENNAI 600113 Western : Manakalaya, E9 MIDC, Marol, Andheri (East) MUMBAI 400093 832 92 95,832 78 58 I 8327891,8327892 BHUBANESHWAR. BHOPAL. BANGALORE. Branches : AHMADABAD. COIMBATORE. FARIDABAD. GHAZIABAD. GUWAHATI. HYDERABAD. JAIPUR. KANPUR. LUCKNOW. NAGPUR. PATNA. PUNE. THIRUVANANTHAPURAM. Printed at New India Printing Press, Khwja, Indm NO. 1 MARCH 2000 TO IS 1161 : 1998 STEEL TUBES FOR STRUCTURAL PURPOSES - SPECIFICATION (Fourth ( Pqe 5, clause 12.1, `trade-mark'. line 2 ) Revision) Insert `grade of the steel' after the words AMENDMENT (MTD 19) Reprography Unit, BE, New Delhi, India AMENDMENT NO. 2 APRIL 2M6 TO 1S 1161:1998 STEEL TUBES FOR STRUCTURAL PURPOSES -- SPEC~ICATION ( Foutih Rwtiwn ) ( Page `~W' 1, clause 1, line 4 ) -- Substitute `WIW' in parenthesis in parenthesis. for .( Page 1, clause 5.1) -- Substitutethe following for the.existing clause: `Steel tubs shall be manuftiured tiough one of the following processes as given in Table 3 and shall be supplied in conditions as shown therein a) b) c) d) Hot finished seandess @S) Cold finished s~ess (CDS) Hot-finished welded ~~; and Electric resistance welded or high ~uenq or ~1~ -de by -d induction welded @RW NOTE -- Tuk welding we not covmedby his ~ntid.' ( Page 1, clause 6.1) -- Substitute `mass' for `weights'. heading 5 ) -- S~ ( Page 2, Table 1, CO1 `~' for `wei~'. for `HFS'. for `ERWMWW' . [ Page 4, Table 3, S1 No. (ii)] -- Substitute [ Page 4, Table 3, S1 No. (M)] -- Substitute `HFS/CDS' `ERWMFIW' ( Page 5, Table 4, under col 2] -- Substitute tie following for the existing Manufacturing Pruss (m19) Repm~phy Uni~ BIS, New Del~ India AMENDMENT NO.3 MAY 2008 TO IS 1161 : 1998STEELTUBES FOR STRUCTURAL PURPOSES - SPECIFICATION ( FOIl'" llnl.rlDlI ) (Pag,3, Table I, col 3, Dla;",1 Nominal Bore ISO .m, 0ut81tJ. Dlam«er 165.t ",m) - Substitute 'Heavy 1'101' 'Heavy'. (Pag, 3, Table 1, col 3, agallU' NomlnDl Bore 200 "''''. DutIl. DltIm.,.,. 219.1 "",,) - Substitute 'Heavy 1'./or 'Heavy'. (Page 3, Tabl. I, col 3, agai",' Noml",,1 Bore 250 """, Oual. Dltllllel.. 273.0 "",,) - Substitute 'Heavy 1t for 'Heavy'. (Page 3, Tabl. I, col 3, against Nominal Bor, 300 1II1II, 0lIl81. Diameter 323.9 "'",) - Substitute 'HeavyI' for 'Heavy'. (Pag, 3, Tabl, l, col 3, agalnsl Nominal Bor, 350 "'''', o.lde DltIIII·· 355.6 mill) - Substitute 'Heavy 1t for 'Heavy'. . (Pag.3, Table I) - Add the following at the appropriate place: NHIIuI DIM ..... (I) ........ 0...... (2) - - ..... aTWc.... IDIII W .... ANI'" c... era ' (6) I...... SectIH v.... l em, . pi,. (7) .... ...... ,...-A-- ....... A. . M..-fJI . .4 oJ,. (9) ....... .... ., .... .... ....... .' - .. GrnII(10) er.... ~ (II) (3) Hel„y2 (4) 5.9 (5) (I) (II) 113.4 (12) 23.2 24.7 31.0 41.6 51.6 6l.J 15O 165.1 Hel„yJ Hawy4 6J 1.0 1.0 10.0 29.5 31.4 39.5 53.1 1.465.0 11272.1 17~7.J 411. 931 993 5119 4793 4616 6313 6116 6157 6132 HeaYy2 324l0.4 31146.4 29907.4 51895.6 50292.· 48715.1 74417.6 72564.1 10110 1222 2960 ]5. 4200 120.3 141.0 270 200 219.1 Heavy) 65.7 78.1 66.6 311 383 Hcavy4 12.0 250 273.0 5.63 5.62 5.56 1.47 7.40 7.3) 9.37 9.31 9.24 11.2 31.12 31.51 30.93 55.71 54.11 53.19 87.16 300 323.9 350 355.6 Heavy 2 1.0 Heavy 3 10.0 Heavy 4 12.0 Hcavy2 1.0 Heavy 3 10.0 Heavy 4 12.0 HeaYy2 10.0 Heay:J 52.3 64.9 77.2 62.3 1071 82.6 91.4 79.4 .S80 11.4 92.3 98.6 111.0 109 130 '5.2 12.0 102.0 70667.2 .1491.9 86396.0 11176 9910 9171 955. 121. 9425 14320 10547 16220 10422 191. 7. 5152 7154 13M 429 524 7951 86.59 .5.33 615 612 151 114 124.12 912 1076 11.1 11.0 112 112 123.29 121.71 149.0 147.76 (MTD 19) RtiiiOiiiPiIY 0....liS:NeW Deiilt IilCHi AMENDMENT NO. 4 JUNE 2011 TO IS 1161 : 1998 STEEL TUBES FOR STRUCTURAL PURPOSES -- SPECIFICATION (Fourth Revision) (Page 1, clause 6.1.2) ­ Add the following new clause after 6.1.2: `6.1.3 Tubes of thickness higher than light tubes specified in Table 1 may be mutually agreed between the purchaser and the manufacturer.' (Page 3, Table 1, col 3, against Nominal Bore 175, Outside Diameter 193.7 mm) -- Substitute `Heavy 1' for `Heavy'. [Page 3, Table 1 (see also Amendment No.3)] -- Add the following at the appropriate place: Nominal Outside Bore Diameter mm (1) 150 mm (2) 168.3 (3) Heavy 3 Heavy 4 Heavy 2 175 193.7 Heavy 3 Heavy 4 175 193.7 Heavy 5 Class Thickness Weight Area Internal of Volume Cross Section cm2 cm3/m (6) 40.3 49.7 33.1 41.6 51.6 61.3 (7) 18 224.9 17 280.1 25 770.0 24 812.0 23 707.0 22 628.0 6 088 6 088 Surface Area External cm2/m (8) 5 290 Internal cm2/m (9) 4 787 4 661 5 692 5 585 5 459 5 334 Moment Modulus Radius Squre of of of of Radius of Inertia Section Gyration Gyration cm4 (10) 1 297 1 564 1 630 2 016 2 442 2 839 cm4 (11) 154.0 186.0 218.0 270.0 328.0 383.0 cm (12) 5.67 5.61 6.63 6.57 6.50 6.44 cm2 (13) 32.20 31.45 43.96 43.16 42.25 41.47 mm (4) 8.0 10.0 6.3 8.0 10.0 12.0 kg/m (5) 31.6 39.0 29.1 36.6 45.3 53.8 (MTD 19) Reprography Unit, BIS, New Delhi, India AMENDMENT NO. 5 SEPTEMBER 2012 TO IS 1161 : 1998 STEEL TUBES FOR STRUCTURAL PURPOSES SPCIFICATION ( Fourth Revision ) (Second cover page, FOREWORD) Substitute `ISO 4200 : 1991 Plain end steel tubes, welded and seamless ­ General tables of dimension and masses per unit length' for `ISO/R 336 : 1976 Plain end steel tubes, welded and seamless ­ General table of dimensions and masses per unit length. International Organization for Standardization'. (Page 4, clause 6.2, Note, line 1) Substitute `10 tonne (Min)' for `10 tonne'. (MTD 19) Reprography Unit, BIS, New Delhi, India